001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.tide.data;
023
024import java.io.Serializable;
025
026import javax.persistence.EntityManager;
027import javax.persistence.OptimisticLockException;
028
029
030/**
031 * Implementation of Tide persistence adapter with a JPA EntityManager
032 * @author William DRAI
033 *
034 */
035public class JPAPersistenceAdapter implements TidePersistenceAdapter {
036        
037        protected EntityManager entityManager;
038
039        
040        public JPAPersistenceAdapter(EntityManager entityManager) {
041                this.entityManager = entityManager;
042        }
043
044    /**
045     * Find an entity in the persistence context
046     * @param entityClass class of the looked up entity
047     * @param id entity identifier
048     * @return the entity with the persistence context.
049     */
050    public Object find(Class<?> entityClass, Serializable id) {
051        return entityManager.find(entityClass, id);
052    }
053
054    /**
055     * Throw an optimistic locking error
056     * @param entity entity instance loaded from the database
057     */
058    public void throwOptimisticLockException(Object entity) {
059        throw new OptimisticLockException("Could not apply change for stale object", null, entity);
060    }
061
062}